Rudder



Feb. 28,1928. 1,661,115

A. FLETTNER RUDDEH Oriiinal Filed June 29, 1920 INVENTOR 110, fawn BY 1 mzmmwm ATTORNEYS Patented Feb: 28 I928 Y ANTON FLETTNER, F BERLIN, GERMANY.

RUDDEB.

Original application filed June 29, 1920, Serial no. 392,839, and in Germany September 22, 1917. Divided and this application filed July 9, 1927. Serial lfo.

The presentinvention relates to the steering of water-borne vessels and more particularly to an improved rudder.

The large ships of today require large rudders which are necessarily very heavy and a very large force is needed to move them, consequently, heavy and cumbersome steering engines are a necessary adjunct to any large steamer. These steering engines consumea great deal of power and furthermore, with these steering systems a considerable time is needed to throw the rudder over completely; With'the ordinary steering engine, about fifty seconds are required 115 to throw the rudder over. It is the object of the present invention to provide a rudder which will not only require less power in its operation, but which can be thrown over more rapidly.

The invention consists briefly in attaching to the main rudder an auxiliary rudder which is at the same time connected with j the ship and in such a manner that the move- 7 .ments of the auxiliary rudder are dependent 2:5 upon those executed by the'main rudder.

The deflection ofthe main rudder willvtake place in the same manner a'sbefore but the r deflection of the main rudder causing a deflection of thefauxiliar rudder in such a 4 Way that under the 'in uence of the forces of flow acting thereon the deflection of the main rudder will now be facilitated by the action of the auxiliary rudder. In other.

words, while the main rudder is bein thrown over by the steering engine, the auxi iary rudder will be steeringthe main rudder in the same direction, i. e. the auxiliary rudder will be displaced y the main rudder in a direction to facilitate the further oscil- "40 lation. of the main rudder). Asa result of the use of this, auxiliary ruddergless power is needed "in steering and the main rudder may be" more rapidly thrown over.

Twopreferredrembodiments of my invention are shown agran'nnatically byway of example in the accompanying drawin In the form of construction accor Fig. 1, the main rudder 3 is mounted on the ship 4 in any appropriate manner- The steering mechanism is not shown as such 1 mechanism is well known and does not form a part of this invention. At the rear edgeof main rudder 3, an pivoted, soas to be freely movable around a pivot or shaft 6. The auxiliary rudder is I 2, the main rudder 3 of a main rudder, means mg to auxiliary rudder 5 is connected by means of a link 7, and a connecting 110d 8, to a projection 9 on the hull of the ship 4. The link and connecting red are so proportioned that when the main rudderv is turned to starboard, the auxiliary rudder is shifted to larboard and vice versa. The extent of the shift depends'on the length of link 7, and connecting rod 8. The dimensions of these elements will depend on the size of the main rudder and may be easily ascertained by any skilled mechanic under given conditions. 1

In the form of execution according to Fig.

is mounted on the ship 4 and the auxiliary rudder 5" is pivoted to the main rudder as before. Stationary sheaves 10, 11 are mounted respectivel on the ship and the auxiliary rudder, an the auxiliary rudder id connectedto the hull of the ship by an endless cable 12 carried by sheaves 10, 11 so that when the main rudder the deflection of the main rudder, effects an acceleration and facilitates the deflection of I) themain rudder.

his applicationis adi'visionof my rioi' application, filed'Jun'e'29, 1920, Seria No. 35

392,839 fora -Method and device for the steering of ships. v I claim: 1 .In a water-borne ship the combination of a main rudder, an auxiliary rudder, means connecting said'auxiliary rudder with the main rudder and 'with the ship for turning said auxiliary rudder relatively to the main rudder in a sense to facilitate turning of the main rudder. 2. In a water-borne shi the combination f dr positivel tumingthe mainrudder, an auxiliary rud er connected with said main rudder near the rear edge thereof and connection between said auxiliary rudder and said ship for turning said auxiliary rudder in a sense counter to that in which said main rudder is being turned.

3. In awater-borne ship, thecombination of a main rudder, an auxiliary rudder connected therewith and means linking the auxiliary rudder with the hull of the ship in such a manner that the steerman in deflecting the main rudder will at the same time displace the auxiliary rudder in a direction to facilitate the further deflection of the main rudder.

4. In a water-borne ship the combination 5 of a main rudder, an auxiliaryrudder mounted on the main rudder near the rear edge thereof, means for positively turning the main rudder, and means linking the auxiliary rudder with the hull of the ship whereby the auxiliary rudder is turned injone direc- 10 tion relative to the main rudder and thus assists in turning the main rudder.

In testimony whereof I afiix my signature.

ANTON FLETTNER. 

